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Finding the Fourth Proportional to 136.42, 204.65 and 90.16

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Solution

The fourth proportional to 136.42, 204.65 and 90.16 is: 135.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.42 : 204.65 = 90.16 : x
  2. Step 2: Convert to fraction form
    136.42/204.65 = 90.16/x
  3. Step 3: Cross multiply
    136.42x = 204.65 × 90.16
  4. Step 4: Simplify right side
    136.42x = 18,451.24
  5. Step 5: Solve for x
    x = 18,451.24/136.42
  6. Step 6: Final answer
    x = 135.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.